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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5744) Revisit append
Date Fri, 15 May 2009 20:51:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12709961#action_12709961
] 

stack commented on HADOOP-5744:
-------------------------------

Thanks Hairong.  Any comment on the unqualified 'delay' made mention of in the spec?  What
kind of time scale should we be thinking in?  If it is an 'hour' as I believe is the current
default for lease timeout, hbase-like applications will have given up the wait long before.
 If its in the tens of seconds -- ~30 seconds -- as I'm currently seeing in HBASE-4379 patches
I'm helping Dhruba test, then that is still too long but tolerable in a first release, as
long as it can be improved on over time ("Instantaneous" would be the ideal).  Thanks.  

> Revisit append
> --------------
>
>                 Key: HADOOP-5744
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5744
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.20.0
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.21.0
>
>         Attachments: AppendSpec.pdf
>
>
> HADOOP-1700 and related issues have put a lot of efforts to provide the first implementation
of append. However, append is such a complex feature. It turns out that there are issues that
were initially seemed trivial but needs a careful design. This jira revisits append, aiming
for a design and implementation supporting a semantics that are acceptable to its users.

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